Vacuum tube



Jul 21, 1925. 1,546,696

J. F. YATES VACUUM TUBE Filed Aug. 7. 1 22 2 Sheets-Sheet 1 /275566 .5 as t/fl 7776s. J a X26,

July 21, 1925. 1.546.696

J. F. YATES VACUUM TUBE Filed Aug. 7. 1 22 2 Sheets-Sheet 2 in/z 7/ Wilma alto: neq

Patented July' 21, 1925.

JAMES IE. YATES, 0F MASSILLON, OHIO.

VACUUM TUBE.

Application filed August 7, $22. Serial No. 580,095.

To all whom it may concern:

Be it known that I, JAMES F. YATES, a citizen of the United States, residing at Massillon, in the county of Stark and State ofOhio, have invented new and useful Improvements in Vacuum Tubes, of which the following is a specification.

In carrying out the present invention it is my purpose to provide an attachment for the audions or vacuum tubes used in the receiving circuits of wireless or other analogous apparatus, which attachment will be so connected in the circuit of the audion as to enable the use of alternating current to heat the filament and enable the operator to have independent and complete control of the plate circuit electro-motive force and permitting a firm control over the potential of the grid circuit.

It is also my purpose to provide an attachment of the class described which will be connected in the filament circuit as to preclude the bum, in the audion heretofore present when alternating current is employedinstead of the usual A battery.

With the above recited objects in view, and others of a similar nature, the invention resides in the construction, combination and arrangement of parts set forth in and falling within the scope of the appended claim.

In the accompanying drawings:

Figure 1 is a view in side elevation of an audion bulb equipped with my attachment.

Figure 2 is a similar View partly in vertical section.

Figure 3 is a horizontal sectional view on theline 33 of Figure 2.

Figure 4 is a diagrammatic view showing the circuit connections.

Referring now to the drawings in detail, 1 designates an audion or vacuum tube comprising a metallic shell 2 and a glass globe 3 having one end arranged within the metallic shell and from which the air is exhausted. In the globe 3 is the usual plate ed as usual in the tuned grid circuit, this circuit also includin in series a capacity C and a shunted varia le capacity 0.

Connected in series with the plate 4 of the audion are the head phones F and the B battery B, the other side of the B battery being connected to the terminal of the grid circuit remote from the grid connection, as clearly shown in Figure 4 of the drawing. In accordance with my invention the terminal 8 of the wire 7 that is connected with the shell 2 is electrically connected in the grid circuit between the secondary S of the oscillation transformer and the B battery,

as illustrated in Figure 4 of the drawings, and the terminals of the filament 5 are connected with the secondary s of. a stepdown transformer, the primary p of which sbepdown transformer is connected with a source of alternating current supply A.

In practice, the filament is energized from the source of alternating current through the step-down transformer, thereby enabling the grid and plate to function properly within the audion and as the received 0s cillations are impressed upon the rid circuit, the variations of current in suc 1 circuit produce sounds in the head phones.

By means of the wire 7 connecting the grid circuit to the filament at the neutral point of the latter, the, hum usually incident to the employment of alternating current is eliminated.

I have entered into a detailed description of the construction and relative arrange ment of parts embraced in the present and preferred embodiment of my invention with a view to imparting a full, clear and exact understanding of the said embodiment. I do not desire, however, to be understood as confining myself to the said specific construction and relative arrangement of parts, inasmuch as in the future practice of my invention such changes or modifications may be made as fairly fall within the scope of my invention as defined by my appended claim.

Having thus described the invention, what I is claimed as new, is

An audion bulb assembly comprising a metallic shell, an evacuated container mounted in the shell and having an insulating base therein, a. supporting conductor mounted in the insulating base and having a lateral end extension therein electrically connected to the shell, said conductor having the other end formed with an offset portion in said container terminating in a downwardly curved end formed with a hook, a filamentary cathode mounted in the container and having the central portion mounted on the hooked end of the supporting conductor and the ends extending through said insulating base, a plurality of contact studs mounted in said base in spaced erative relation to the cathode and having H electrical connection with independent con-"- tact studs on the insulating base. p.

In testimony whereof I affix my signature.

JAMES F. YATES. 

